/*
 * Tencent is pleased to support the open source community by making TKEStack
 * available.
 *
 * Copyright (C) 2012-2021 Tencent. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the
 * License at
 *
 * https://opensource.org/licenses/Apache-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OF ANY KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations under the License.
 */
const flat = (arr: Array<any>) => {
  return arr.reduce((prev, cur) => prev.concat(cur), []);
};

export const flattenDeep = (arr: Array<any>) => {
  let flatten = flat(arr);

  if (!flatten.filter(x => Array.isArray(x)).length) {
    return flatten;
  }
  return flattenDeep(flatten);
};

export const flatten = (arr: Array<any>, isDeep?: boolean) => {
  if (isDeep) {
    return flattenDeep(arr);
  }
  return flat(arr);
};
